Q1 of 23 Page 34

The heaviest fundamental particle is

The heaviest fundamental particle is neutron. The mass of electron is negligible. The mass of proton is slightly less than that of neutron.

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In the scattering experiment the deflection of alpha particle is due to

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The simplest atom that does not contain neutron is

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Fill in the blanks with suitable words:

The total number of protons and neutrons in the nucleus of an atom is known as ________ .